Crash Dive (1943)

On the eve of departing for a dangerous mission, a submariner falls for a schoolteacher, unaware she is the sweetheart of his commanding officer. On board, the two men eventually discover they are romantic rivals, but form a close bond as they concentrate on their duty and the task of destroying enemy U-boats. Romantic wartime drama, starring Tyrone Power, Dana Andrews, Anne Baxter, May Whitty and Harry Morgan.